I have the RearViewSafety 7 inch monitor and wireless camera.
What makes the 7 inch monitor important:
I have the Monitor as far to the right as possible on the dash.
So it is effectively next to the right side rearview mirror.
In some aspects, it acts as a second mirror on the right side.
It acts as a good verification as to when truly clear of a passed vehicle.
The 7 inch helps since it so far away from the driver.
I do have a problem with RF interference.
I have the TST TPMS and the Ford truck came with tire pressure monitors.
The RearViewSafety monitor causes interference with one of the truck's built in pressure sensors. I get a lost communication error message on the dash.
I turn off the Monitor, wait a while, and error goes away. Then I can turn the monitor back on and it will be a while, (maybe hours) before the trucks alarm raises again.
I did add the TST TPMS RF repeater and that does seem to help.
So far very pleased with the RearViewSafety system.
One huge benefit is at gas stations. Sometimes needing to back up just a few feet after filling with fuel, and being certain that no one has pulled in behind me and blinded by both normal mirrors. Worth every penny in those situations.
For whatever it is worth: I did add the rear camera with no holes in the trailer.
I mounted it inside above the rear dinette table and looking through the rear window. I am all about not drilling holes when possible. Plus 12 volt
power was right there below the dinette from the sub-woofer.
Hopefully that helps your search.